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Discipulus => sub{
        my @list = sort {$a<=>$b} @input;
...
        Compare(\@list,\@output) or die "@list" if DO_CHECK;
    },

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Discipulus4 => q{ # https://www.perlmonks.org/?node_id=1229437
        @list = sort {$a<=>$b} @list;
        if ($list[0] < 0 and $list[-1] >= 0)
            { push @list, shift @list until $list[0] >= 0 }        },